Kleinanzeigen: The Concept of "Becoming German"

[Papa Carder]

The main task is to create and maintain the image of an ordinary German citizen. Not a hacker, not a businessman, but a kind of Hans from Munich who decided to sell his old grill. Any deviation from this image is a red flag for the system. Anomalies are your main enemy.

Step 1: Foundation – Technical Base​

An error at this stage renders everything else meaningless.

Proxies:
Only German residential or mobile proxies. No VPNs or datacenter proxies. Kleinanzeigen antifraud first checks your IP address. It shouldn't just be German, but clean, preferably from the same region where you plan to live. If your IP is from Berlin, and you post an ad in Frankfurt with the "pickup only" mark, the system will struggle.

Anti-detection browser:
Any browser will do, but I recommend Vision Browser. Profile settings are more important:

• Browser language: de-DE, de;q=0.9. This is critical.
• Time zone: Europe/Berlin.
• Geolocation: Must match the proxy IP. No real IP leaks.
• Fingerprint: Choose a typical German fingerprint for a Windows 10/11 PC, not the most sophisticated one. No MacBook Pro M3 Max, unless the IP is from the most expensive district of Hamburg. The goal is to be inconspicuous.

How to use Akamai Bot Manager​

It's important to understand that Kleinanzeigen uses Akamai Bot Manager to protect against bots and fraud. This isn't just an IP filter; it's a multi-layered system that analyzes hundreds of parameters. The goal is to completely mimic human behavior to avoid Akamai's detection.

Here's what to consider:

• Cookie _abck: When you visit a website, a cookie named _abck is immediately installed in your browser. This is a unique and well-known "passport" issued by Akamai Bot Manager Premier, a top-tier solution for protecting against bots and fraud. This cookie tracks your reputation and behavior within the global Akamai network. Conclusion: We warm up your profile with cookies the first time you log in.
• Behavioral Fingerprinting: Akamai analyzes page interactions: Mouse and keyboard movements: It's important to simulate natural cursor movements, random delays when typing, and natural scrolling speeds. No direct clicks or instant form filling.
• Reaction time: Enter data at a human speed, not too fast and not too slow. A person doesn't fill out a form in 0.5 seconds.
• JavaScript challenges and sensor data: Akamai actively collects data through JavaScript to determine whether a browser is legitimate. An anti-detection browser (Vision Browser or similar) must perfectly replicate all parameters collected by Akamai: Canvas, WebGL, fonts, plugins, browser settings, and hardware parameters. Any discrepancies in these fingerprints will raise suspicion. Don't disable JavaScript! Akamai actively uses it to collect data and evaluate behavioral factors.
• TLS/HTTP fingerprints: Ensure that your browser (or automation tool you're using) is sending valid and natural HTTP headers. JA4 should match the actual browser. Standard request libraries often have easily detectable fingerprints.
• Akamai maintains a database of thousands of TCP/IP fingerprints corresponding to various operating systems, network devices, and known botnets or proxy servers. If your TCP fingerprint doesn't match the expected value for the declared User-Agent and other browser parameters, it will immediately raise suspicion.
• IP reputation: Akamai maintains huge databases of bad IP addresses. This is why it's so important to use clean, high-quality residential or mobile proxies. If your proxy has previously been used to attack other Akamai-protected websites, you'll be banned immediately.
• Machine learning: Akamai constantly learns from millions of queries. If your behavior even slightly resembles bot patterns Akamai has already seen, the system will detect you. This is why natural account warm-up and full conformity with the "Hans" image are so important.

In summary, regarding Akamai: The goal isn't to "bypass" Akamai, but to become invisible to it, completely blending in with the flow of ordinary German users. Any automation, any script, must be as humanized as possible and imitate all aspects of real interaction.

Step 2: Account – The Face of Your Legend​

There are two approaches, each with its pros and cons.

Logs (accounts)
Ideal option. An account registered several years ago, with reviews, old messages, and ads — it's gold. You can set your own filters on the emails from the logs so the holder doesn't see any activity (on some accounts, you can even delete/rebind the number (if you know the original password), but account sellers know this and do it in advance to add $5 to the account's price). This method inspires maximum trust. The downside is that you don't know when the real owner will restore it. This is a short-term solution.

Self-registered

• Verification by number: Kleinanzeigen requires a German phone number. Cheap SMS activators are a dead end; these numbers are blacklisted. The solution is to rent high-quality virtual numbers or physical SIM cards through services. It's more expensive, but it's the only way to pass verification and be able to get a repeat code.
• Only tests will show a good supplier with clean numbers.

Step 3: Warm-up – The most important step​

This is where 99% of users fail. You can't just register an account and immediately post an ad for an iPhone 15. You'll get banned during moderation. It takes 3 to 7 days to warm up.

• Day 1-2 (Passivity): Log into your account for 15-20 minutes.
• Scrolling through your city's news feed. You're looking for something simple: winter tires, a child seat.
• Add 2-3 ads to your favorites (Merkliste).
• You're going out.
• Day 3-4 (Minimal activity): You come back and scroll.
• You write to one or two sellers with the most stupid and natural question: "Hello, noch da?" (Hello, is it still available?). You don't even need an answer. You're just creating the appearance of a real user.
• Days 5-7 (Test Ad): Post a junk ad. This is a system test. It should be as harmless as possible.
• Examples: Verschenke alte Zeitschriften (Giving away old magazines for free), Verkaufe Blumentopf für 2€ (Selling a flower pot for 2 euros).
• The goal is for the ad to pass moderation and stay up for a day or two. If everything goes smoothly, the account is ready.

Step 4: Work - The Final Act​

Once the account is warmed up and has trust, you can list the main product.

Product and description
Choose a fast-moving product, but avoid ultra-popular items like game consoles or the latest iPhones — they are subject to special monitoring. The price should be slightly below market value, but not absurdly low. The description should be written in natural German. Don't use Google Translate directly. Use AI (GPT) with a prompt like "write a listing for [product] in a typical, non-perfect style, possibly including minor abbreviations." Images should be unique.

Screenshot of a phishing page

Communication and link substitution​

This is the key moment where all your preparation pays off. Forget about using instant messaging. All the work is done within the Kleinanzeigen chat. Don't forget about Content Analysis / Content Filtering and the fact that the Akamai bot analyzes the message content, as well as Malicious URL Detection.

1. Beginning a Dialogue: You answer the customer's question ("Ist der artikel noch verfügbar?") politely, but not immediately. ("Yes, the item is still there. It works perfectly.")
2. Building Trust: The buyer asks about delivery and payment. Here, you must play the role of a cautious and modern seller. Your response should be: "I only sell through the 'Secure Payment' function from Kleinanzeigen. It's the safest for both of us." This not only makes you look legitimate but also helps them understand the concept.
3. Link Submission: Once the buyer agrees, it's your turn. You should present the phishing link not as a request, but as a fait accompli and an act of assistance to the buyer.
   Example dialogue:
   

   You: Very good. I have already initiated the sale through the system. I want to confirm the delivery address and complete the payment. Here is the official transaction page that Kleinanzeigen created for us.
   Translation: "Great. I have already initiated the sale through the system. You only need to confirm the delivery address and complete the payment. Here is the official transaction page that Kleinanzeigen created for us."

   And immediately after this message, you send your phishing link. The link should be disguised as the Kleinanzeigen domain (for example, kleinanzeigen-sicher-bezahlung.de or something similar).
4. Handling Objections: If the buyer hesitates or says something doesn't work, stand your ground. It's strange, it works for me. It's the official system, I don't sell it any other way, sorry. There are too many scammers these days. This tactic positions you as a victim who is afraid of being deceived, which lowers their guard.

Screenshot of a phishing page.

Successful work with Kleinanzeigen isn't about technique, but about patience and social engineering. Antifraud, including Akamai Bot Manager, catches those in a hurry. Those willing to spend a week impersonating an ordinary German bypass the system because they cease to be a technical anomaly and become "real" users.

Additional:
Regarding the phishing, most people understand. Regarding PayPal, the phishing involves payment and PayPal login.

Screenshot of the PayPal phishing.

In a team, one person usually handles the payment process, while the other (the handler) sees the log pass in the control panel and requests 2FA, also through the control panel. Then, PayPal is processed. I can't speak about PayPal processing, but some guys can earn up to $100,000 per day per person, and the methods don't apply.

The same principle applies not only to Klein but also to other industries, but the offer must be well-structured. That's a separate topic.

I suggest discussing the following issues: logs or self-registration? Communication methods on the platform? SE in Kleinanzeigen. And finally, the work of a freelance artist, monetization methods.

P.S. The technical description of Akamai is brief, as is the brief description of its fingerprints. If you like the article (this is my first time writing, so please don't judge me too harshly), we can delve deeper and begin ongoing research for a bypass.

(c) kosheemod